as far as kits on the market go,
AFV club's 251's and their new Tiger late, The tristart Pz I and IV, Tamiya Stug III ausf G, and from dragon, all of their 251's and their tiger, and from trumpeter, I like all of their new WWII era kits.
thats a brief list of what I "want"
Kits that are not yet being made
Horch German ambulance
sdkfz 251/20
sdkfz 251/1 ausf A (dragon and AVF club are making them)